The long-awaited details of US President Donald Trump's tax plan are beginning to come together.

In November, the House voted to pass the "Tax Cuts and Jobs Act," which Trump has said he wants finalized and on his desk before Christmas. The Senate passed its own version early Saturday. Republican leaders are likely headed to a conference committee to combine their separate bills into a final tax reform plan.

One tax-reform theme has been consistent since the days of candidate Trump: The federal income-tax brackets could be simplified from the seven we have today.

The charts below shows what we know so far about how Trump's tax plan could change federal income-tax brackets compared to 2017 tax brackets.

Andy Kiersz/Business Insider

Andy Kiersz/Business Insider

House Republicans have proposed four federal income tax brackets: 12%, 25%, 35%, and 39.6%. The plan laid out by Senate Republicans keeps seven tax brackets, but tweaks the rates and the income ranges associated with each. The brackets proposed are 10%, 12%, 22%, 24%, 32%, 35%, and 38.5%.

Most Americans — about 70%— claim the standard deduction when filing their taxes. For those who do, their paychecks will almost certainly increase if Trump's tax plan passes, thanks to proposed tweaks to the current standard deduction and tax brackets.

In 2017, the standard deduction for a single taxpayer is $6,350, plus one personal exemption of $4,050. The House's proposal essentially combines those into one larger standard deduction: $12,200 for an individual, and $24,400 for joint filers.

"We have to acknowledge that any effort to cut or reform taxes is inevitably more complicated than tackling healthcare," Mark Hamrick, the senior economic analyst at Bankrate.com, said in an email. "Healthcare involves around one-sixth of the US economy, while taxes covers pretty much everything. That makes the broader fight even larger and more complicated."